Sufficient density

Sufficient density means any number, spacing, and combination of collection system components, including vertical wells, horizontal collectors, and surface collectors, necessary to maintain emission and migration control as determined by measures of performance set forth in this part.

Source

40 CFR § 60.41f

Scoping language

Terms used but not defined in this subpart have the meaning given them in the Clean Air Act and in subparts A and B of this part.